The linear range and lower limit of determination of 5 kinds of benzimidazole drug residues in milk and milk powder

17.

Pipette the mixed standard stock solution of benzimidazole drugs, and dilute with the blank sample extract to prepare the concentration to be 0.

A standard working solution of known concentration was added to the blank sample, and the sample preparation was carried out according to the above method.

Table 17-13 Linear regression equation

17.

Add a mixed standard solution of five kinds of benzimidazole drugs to the milk and milk powder samples, operate according to the above test method, and make a blank control at the same time

Table 17-14 Recovery rates of five benzimidazole drugs at different levels of addition (n=6)

17.

Under repeatability test conditions, the absolute difference between the two independent test results obtained does not exceed the repeatability limit (r).

Table 17-15 The concentration of five benzimidazole drugs in milk and milk powder and the reproducibility limit and reproducibility limit equation